<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=100%, initial-scale=1.0">
    <title>变量的变量</title>
</head>
<body>
    <h1>变量的变量</h1>
    <?php
    $shu = 'biao';
    $biao = 'wo';
    $wo = 'test';
    $test = 'sina';
    $sina = 'zhongguo';
    $zhongguo = 'china';
    $china = '我爱你';
    //别运行，自己去推理一下代码。也写几个可变变量玩玩吧！
    echo $$$$$shu;
    ?>
</body>
</html>